package com.yanjr.common.utils;

import java.security.SecureRandom;
import java.util.UUID;

import org.springframework.util.IdGenerator;

/**
 * 封装各种生成唯一性ID算法的工具类.
 * @author ThinkGem
 * @version 2013-01-15
 */
//public class IdGen implements IdGenerator, SessionIdGenerator {
public class IdGen implements IdGenerator {
	private static SecureRandom random = new SecureRandom();
	
	/**
	 * 封装JDK自带的UUID, 通过Random数字生成, 中间无-分割.
	 */
	public static String uuid() {
		return UUID.randomUUID().toString().replaceAll("-", "");
	}
	
	/**
	 * 使用SecureRandom随机生成Long. 
	 */
	public static long randomLong() {
		return Math.abs(random.nextLong());
	}

	/**
	 * 基于Base62编码的SecureRandom随机生成bytes.
	 */
	public static String randomBase62(int length) {
		byte[] randomBytes = new byte[length];
		random.nextBytes(randomBytes);
		return Encodes.encodeBase62(randomBytes);
	}
	
	/**
	 * Activiti ID 生成
	 */
	public String getNextId() {
		return IdGen.uuid();
	}

//	public Serializable generateId(Session session) {
//		return IdGen.uuid();
//	}
	@Override
	public UUID generateId() {
		return UUID.randomUUID();
	}

	
	public static void main(String[] args) {
		System.out.println(IdGen.uuid());
		System.out.println(IdGen.uuid().length());
		System.out.println("==" + IdGen.randomLong());
//		System.out.println(new com.thinkgem.jeesite.common.utils.IdGen().getNextId());
	}

	
}
